含碳量对淬火-配分-回火工艺处理钢力学性能的影响
Effect of Carbon Content on Mechanical Properties of Steel Treated by Quenching-partitioning-tempering Process
王存宇, 时 捷, 曹文全, 董 瀚
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作者单位：钢铁研究总院 结构材料研究所, 北京 100081
中文关键字：马氏体； Q-P-T工艺； 力学性能； 残余奥氏体
英文关键字：martensite; quenching-partitioning-tempering process; mechanical property; retained austenite
中文摘要：比较了含碳量为0.21%～0.41%的高Si钢经“淬火-配分-回火(Q-P-T)”工艺和传统淬火回火(Q-T)工艺处理后力学性能的差异，用SEM、TEM和XRD法表征微观组织。结果表明，相对于传统Q-T工艺，经Q-P-T工艺处理的样品强度降低，塑韧性升高，随含碳量从0.21%增加到0.41%，强度降低幅度从70 MPa增加到230 MPa，断后伸长率提高的幅度从0.5%提高到2.5%，断面收缩率提高幅度从1.5%增加到3.5%，冲击吸收功提高幅度在5.6～15.0 J间波动。分析认为碳的脱溶是Q-P-T工艺处理钢强度降低的主要原因，一定量的稳定的残余奥氏体和各相的协调配合是塑韧性提高的主要影响因素。
英文摘要：The mechanical properties of high Si steel with 0.21%～0.41%C treated by quenching-partitioning-tempering (Q-P-T) process and traditional quenching and tempering (Q-T) process were compared, and microstructure characterizations were examined by SEM, TEM and XRD. The results show that compare with samples treated by Q-T process, the strength of those treated by Q-P-T process decreases while the plastic and toughness increases with the increase of carbon content from 0.21% to 0.41%, strength reduction range increase from 70 MPa to 230 MPa, and the extent of increased total elongation and area reduction increases from 0.5% to 2.5% and 1.5% to 3.5% respectively, the impact absorption energy increase 5.6～15.0 J. It is concluded that the escaping of carbon from martensitic matrix decreases the strength in samples treated by Q-P-T process, and the exist of stable retained austenite and the coordination of phases affects the ductility and toughness mainly.